TWRP is by far the most popular custom recovery as of late. Flashing ROMs, backing up your device, managing files in a pinch - TWRP makes it all easy. The custom recovery has extended its reach to six more devices, three of which are from Samsung.
Samsung devices now supported include the Galaxy Note 4 Duos (International), Galaxy Note 7 (China Qualcomm), and Galaxy S7 edge (China Qualcomm). There is also a sprinkling of other devices now supported, such as the Huawei Ascend Y550, Archos 55 Diamond Selfie, and LeEco Le Max 2.
While I haven't heard of the latter two devices, I'm sure many are excited for the extended Note7 support.